Steam-boiler



(Modem 2 Sheets-Sheet 1.

T. GRITGHLOW. STEAM BOILBR. No. 244,193. Patented July 12,188l.

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YT. CRITCHLOW.

STEAM BOILBR P'atemed July 12,1881.4

messes SDM UNITED STATES PATENT OEErcE.

THOMAS GRITCHLOW, OF STEELTON, PENNSYLVANIA.

STEAM-Bolling.

SPECIFICATION forming part of Letters Patent No. 244,193, dated July 12, 1881. Application mea April 21, 1an.' (Model.)

To all whom t may concern:

Beit known that I, THOMAS GErroHLow, of Steelton, in the county of Dauphin, and in the State of Pennsylvania, have invented certain new and useful Improvements in Steam- Boilers and Furnaces therefor 5 and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters ofreierence marked thereon, making a part of this speciiication.

This invention relates to certain improvements inY steam boilers and boiler-furnaces, andit has for its objects to provide an improved arrangement of the tubes, whereby the heat passing through the flue ot' the boiler will be more effectually utilized than heretofore; to provide for moren effectually connecting the crown-sheet with the outer casing of the boiler, and to secure a uniform temperature around tho'outer casing ofV the boiler to prevent loss of heat from radiation, as more fully hereinafter specified. These objects I attain by the apparatus illustrated in the accompanying drawings, in which-l Figure 1 represents a longitudinal vertical section of my improved boiler and furnace Fig. 2, a top view of the boiler and furnace with the upper portion of the furnace removed, and Fig. 3 a transverse vertical section through the lire-box and the adjacent portions of the furnace. Fig. 4 is a detail view of the braces.

The letter A indicates the walls of the furnace, which may be constructed of brick-work or other suitable material.

The letter B indicates the boiler, 'which is mounted in the furnace in the usual or any convenient manner.

The letter O indicates the fire-box, and D a horizontal ilue leading therefrom to the smoke b oX or chamber E, from the upper part of which the smoke-stack F extends. Through the horizontal lue extend vertically a series of verticaltubesfggconnectin g the upper a``d'lo`we' of the stays K, which are attached to the connections L bolted to the inside of the outer casing of the boiler. The outer ends of these crown -bars rest upon and are connected by bolts or rivets to the horizontal angle-irons Q', the latter being iirmly secured tothe inner walls of the outercasing of the boiler by means of suitable bolts. These crown-bars thus serve to prevent the lateral expansion of the outer sheeting or" the boiler.

Located between the outer wall or sheet of the boiler and the horizontal line D, on opposite sides of the said flue, are braces V W. The portion V of each of these braces terminates in flanged ends or heads n, which are connected by bolts or other suitable means to the outer sheeting ofthe boiler. The portion W also terminates atits ends in like heads, which are similarly connected to outer wall of the liuc D. Where the elbows of these braces cross each other they are secured together by rivets or bolts or other convenient means. These braces are placed at suitable intervals along the sides of the boiler, and their function is to prevent the collapsing of the sides of the flue, and, further, to act as a strengthening-brace for the boiler-sheet. This llue displacing a considerable volume of Water in the boiler, it is found in practice that it has a disposition to rise, and by the use of these braces V W, I eftectually overcome this tendency.

The letter M indicates the steam-dome, and N the man-hole, of the boiler. l

The space below the boiler is divided into a series of compartments, P, by means of the partitions Q, and the upper part over the boiler is divided into connecting compartments It, formed by the partition S.

Through the rear of the lire-box extend the fines T. which open, into the first of the chambers wpartments P, and from the l,a st.of said compartments Pettlsaf'o'pepffgll, to the smoke-boxE wm w n The operation of my invention will be readily understood in connection with the above description and is as follows: The products of combustion pass through the ilue D, imparting their heat to the Water in the tubes Gr, heating the same and causing a thorough circulation. A portion of said products of com- IOO bustion passes through the lues T, and successively through the chambers I? and R, and from thence through the opening U into the smoke-box E, thus uniformly heating the en- 5 tire outside of the boiler and effectually preventin g loss of heat by radiation.

Having thus described my invention, What I claim, and desire to secure by Letters Patent, 1sro 1. In combination with the re box, the boiler having flame aperture T and suitable lues at the rear thereof, the alternating chambers surrounding the boiler and communicating with the smoke-chamber, and the uptake, t5 substantially as and for the purposes specied.

THOS. ORITOHLOW.

Witnesses G. W. JACKSON, RoBT. M. STURGEON. 

